Lady Antebellum -- Tour Bus Bursts Into Flames

Garland PD tells TMZ the fire was caused when the right front tire on the bus blew out.

Lady Antebellum singer Hillary Scott had to flee from her tour bus when the whole thing went up in flames Thursday morning in Texas.

The group was heading to Dallas for the Country Music Awards when the fire broke out. Hillary says it started when one of the bus' back tires lit up.

Hillary says she was on board with her husband, tour manager and driver -- but they all managed to get off safely. Firefighters are still on scene clearing up debris from the interstate.

Still unclear why the tire caught on fire -- and authorities haven't confirmed that's what really caused the blaze.